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HTTP defines several headers that a server may send to a client with an HTTP response. These are known, appropriately enough, as response headers. HTTP also defines entity headers, which are sent with an HTTP body, some of which are also applicable to an HTTP response. Some of these are obligatory, for example, Content-Type. Apache will add the others by itself automatically, for example, Date and Server. You can also add your own headers to control the browser s behavior in various ways, for example, Expires, Last-Modified, or Set-Cookie.

Adding a header to a CGI response just involves adding it to the end of the header section. For example, the following CGI script extract adds a header, which tells the browser not to cache the body of the response in its own cache:

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The first line of this method creates the content for the newsletter with a call to getNewsletterContent(): private String getNewsletterContent(){ // Load the top stories. IStoryManager manager = StoryManagerBD.getStoryManagerBD(); Collection stories = manager.findTopStory(); // Now build the content. StringBuffer buffer = new StringBuffer(); // Header buffer.append("Dear Member,\n\n") .append("Here are the top stories from the JavaEdge web site:\n\n"); // Body Iterator iter = stories.iterator(); while(iter.hasNext()) { StoryVO story = (StoryVO)iter.next(); buffer.append("***************************************************\n") .append(story.getStoryTitle()) .append("\n") .append(story.getStoryIntro()) .append("\n") .append("<http://localhost:8080/JavaEdge/execute/storyDetailSetup storyId=") .append(story.getStoryId()) .append(">") .append("\n"); } // footer buffer.append("***************************************************"); return buffer.toString(); } The getNewsletterContent() method retrieves the list of top stories from the JavaEdge database with a call to IStoryManager.findTopStory(). Once the list is loaded, the getNewsletterContent() method builds the newsletter content in a StringBuffer object.

You can add as many headers as you like to an HTTP response, as long as you obey the following three rules: The response must contain a Content-Type or Transfer-Encoding header Each line in the header must conform to a proper header, with a name and a colon, separating it from the value. The header (if there s one) must be separated from the body by an empty line. It follows from the previous rule that a header can t be sent after a blank line, so all headers must appear one after the other separated by a single linefeed. Servers can send any entity or response header to a client. Of course, a script can actually send any header it likes, but only those defined by HTTP as legal response headers or legal entity headers will be acknowledged by most clients. Refer to Online Appendix H for a complete list of headers.

Simply put, a web service can be defined as any application component that exposes its functionality by using standard web protocols. Gartner (http://www.gartner.com) offers the following web services definition: Web services are loosely coupled software components that interact with one another dynamically via standard Internet technologies.

Because CGI scripts are run through Apache rather than directly, it s more difficult to debug them than a normal program; running a debugger is tricky when the output is being sent to a browser. For example, you can frequently find yourself presented with the unhelpful message premature end of script headers in the error log or a no data error from the client and nothing else to show for it. Also, recent releases of Internet Explorer complicate things by putting in default content type information if they don t receive any data. What s actually happening most of the time when this problem arises isn t a premature end of the headers but a premature start of the body text or a totally broken script. This is commonly caused by a debug message sent to the output of the script before the headers have been sent. The first thing that Apache gets from the script is clearly not any kind of header, so it must ipso facto be part of the body, according to HTTP and CGI. Because you must, at the least, have a Content-Type header, this means the body started prematurely, hence the error. The real headers often turn up immediately afterward, but because they re now in the body, they re (correctly) ignored. Unfortunately, this is hard to see if you re testing with a browser. You can t even use telnet to view the result directly;

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